Liquid-dispensing apparatus



w. CQJQNES LIQUID DISPENSING APPARATUS Nov. 6', 192s. 1,690,730

Filed July 6. 1926 -s shams-sheet 1 mgl mvENToR Nov. 6, 1928. 1,690,730

w. c. JONES LIQUID VDISPENSING APPARATUS Filed July 6. 1926 s sheets-sheet 2 Eby-4 :j Jfkg W C Jone NOV. 6, 1928. A 1,690,730

w. c. JONES LIQUID DISPENSING APPARATUS Fild Jul'f, 1926 s' sheets-sheet 3 3. R 6 Y M@ G\J\wm C wm m1 mw w W w* QT A m .MQKN Q mh\ A mm mm n wm l.. L AIUTI Lui wm um r. f l Qn 4 K W n vm\ Q Q m? mm up IX Q. A

BY QS ATTORNEY i. Patented Nov. 6, 1928;

UNITED STATES WILLIAM C. JONES, F ALAMEDA, CALIFORNIA.

LIQUID-IDISIIEN'SING APPARATUS.

Application led July 6,

This invention relates to improvements in coin control dispensing devices, my principal object being to provide in connection with any modern type of pump and any suitable means for operating the same. a coin and electrically controlled mechanism. for causing the pump to automatically operate only for a sufficient length of time necessary to deliver aV quantity of the liquid of a certain definite 1U value or volume, depending on the value of the coins deposited; and to prevent the pump from operating unless such coins are first deposited.

I have particularly in mind to utilize my 5 apparatus for the dispensing of gasoline and the like, without the necessity of a station attendant being present, though the device can also be used in connection with the dispensing of lubricating oils and any other 2" liquids. Y

In this application I have shown the control apparatus as applied to a standard electrically driven pump of the verticalv barrel and plunger type having a certain capacity 5 per stroke; and have provided means for automatically causing the strokes of the pump to be repeated until the total volume of liquid pumped corresponds in value to the i coins deposited, regardless of whether such 'i0 total is reached with one or more full strokes v of the pump or with a fractional stroke of the pump; and for then automatically causing the motor to stop and the pump plunger to return to its starting or zero position at the bottom of the barrel.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Fig. l is a sectional elevation of the traveller and follower mechanism arranged in connection with a pump rack.

Fig. 2 is an end view of the traveller.

Fig. 3 is an end view of the follower.

Fig. 4 is a sectional elevation of the coin chute and Contact mechanism closed by the insertion of a coin in the chute.

Fig. 5 is a conventional or diagrammatic elevation of a motor driven pump structure.

Fig. 6 is a diagram of the electric circuits used in connection with the control mechamsm.

In connection with this diagram it is to be 1926. Serial No. 120,708.

noted that the various electrically operated parts are not arranged in the positions actually occupied, but rather in convenient relation to their respective circuits in order to simplify the circuit lay-out and render said circuits more readily followed.

Referring now more particularly to the characters of reference on the drawings, the pump apparatus with which my control structure is to be associated comprises essentially a vertical pump barrel l connected at its bottom to a source of liquid supply 2. A piston' 3 in the barrel, such as is commonly used, is connected to a vertical rack 4, whose length is substantially that of the stroke of the piston. The upward movement of the piston from the bottom of the barrel dispenses the capacity of the barrel through a hose 5 leading from the top of said barrel. The piston is raisedwby a pinion 6 engaging the rack and driven at a suitable speed by an electric motor 7 This pump structure is of such a nature that unless the motor is ,being driven the rack will tend to descend and will normallyrest with the piston at the bottom of its stroke.

My mechanism or system to automatically control the operation of the motor comprises a coin handling unit A, which controls the operation of a traveller unit B, and a follower unit C, operated by the pump rack and limited in its movement by the traveller unit.

The unit A comprises a casing 8 installed at any convenient point, in which casing is fitted a predetermined number of independent coin chutes, for different sized coins, one typical chute being shown at 9. The chutes are arrangedto receive coins vertically or on edge and they have a downward slant from their upper ends so that the coins will roll down the chutes. The mouths of the coin chutes are on one face of the casing, while their lower ends are positioned to discharge into a coin receptacle l0 mounted in the casing. Projecting inwardly from one coinedge engaging side of each chute, some distance from the mouth thereof is a movable apron l1, which is pivoted at its upper end onto the chute and is adapted to be swung outwardly by the weight of a coin rolling over said apron toward the coin receptacle. The apron has a contact 12 normally spaced from but adapted to engage a relatively fixed contact 13 when the apron is moved by a coin. These contacts are interposed in a circuit, as hereinafter described, in which circuit these contacts are collectively designated as D for convenience of reference. v

. Mounted adjacent Lthe casing above the chute mouths is a vertical shutter or plate 14 connected to an arm 15 pivoted in the casing. This arm is attached tothe core 16 of a solenoid 17 which is interposed in the main circuit, as hereinafter seen. When the solenoid is energized (which is its normal con dition) the arm 15 is held up and the plate 14 is held clear of the chutes. When the solenoid is deenergized the arm and plate drop of their own weight and cover the chute mouths so that no coins can then be inserted into said chutes.

I have here shown and described Yonl those features ofthe coin apparatus whic are essential to the invention, since coin weighin and rejectin devices, such as are commo y used, may e incorporated with this structure without affecting the operation of the motor control system.

The traveller unit B comprises a horizontal I base plate 18 fixed relative. to the rack 4 and extending across in front of the same. Supported in bearing members 19. projectin upwardly from the base 18 is a sleeve. 20 aving a plurality of pinions 21 fixed thereon. A spline shaft 22 is slidably mounted in the sleeve, said shaft at one end being threaded through the adjacent bearing member 19, as shown at 23. This structure isdisposed so that the shaft 22`is parallel to the motor driven pinion 6. Meshing with the pinions 21 are gears 24, which are mounted on a shaft 25 journaled in parallel and fixed relation to the shaft 22. Each gear has a'ratch'et i pinion 26 mounted in fixed connection therewith, each pinion being engaged by a vertical rack 27 having ratchet shaped teeth. The

v pinion and rack teeth are so designed that tion of the system.

when any rack moves upwardly, the corresponding'` pinion is drivinlgly engaged to cause the gear24 to turn, wh` e the other pinions merely turn past their respective racks. The racks are free at their lower ends but are pivoted at their upper ends onto the cores 28 of solenoids 29 which are mounted' in vertical positions on a frame 30 supported by the base 18. AS many solenoids are used as there are coin chutes, and they are connected in circuit' with the res etive contacts D as hereinafter shown. n this case four such solenoids are shown, but it will be evident that this number maybe increased or dimin- .ished as desired withoutafectng the operay These parts are so arranged that when the solenoids are deenergized and their cores dropped, the upper ends of the racks 27 are 'then ad'acent the horizontal center line of the rate ets 26. To prevent further downward'movement of the racks suitable sto means as shown at 31 maybe provide When any solenoid is energized the corre- .ratchet wheel 47.

sponding rack moves upwardly, rotatingr its ratchet wheel and consequently the pinions 21 and the shaft 22. This of course will cause a longitudinal movement of the latter owing to the threaded engagement of said shaft with the fixed bearing 19. v

Each rack is normally held in constant engagement with its ratchet wheel by a weight 32. To release the racks from the ratchet wheels at a predetermined time in the operation of the structure, I provide pivoted release arms 33, one for each rack, whose outer ends face the tooth-faces of the racks at their lower ends. These arms are moved simultaneously'so as to cause the same to bear against and press the racks clear of the ratchet wheels, by an electromagnet 34 whose armature 35 is connected to t-he arms 33 in 'a suitable manner. To cause' the shaft 22 to then turn in a direction opposite to that imparted thereto by the. raising of the racks, the sleeve 20 adjacent one end is formed as a drum 36 about which is wound a cable 37 having a wei ht 38 on its lower end.

The unit also mounted on the base 18, comprises a shaft 39, disposed in longitudinal alinement with the shaft 22.. The shaft is threaded at one end as at 40 through a supporting bearing 41 mounted on the base 18. Turnabl mounted in the bearing 41 and in another earing 41 is a sleeve 42 surrounding but clear of the shaft 39, and held againstv .longitudinal movement relative thereto.. A

gear 43 engaged by the pump rack 4 is fixed on .sa-id sleeve, as is a dise 44. This dise has a plurality of solenoids 45 mounted thereon radiall of the shaft, the cores 46 of these solenoids This ratchet Wheel has a hub 48 which has spline'engagement with the shaft 39 as shown at 49. The shaft is slidable through this hub, the latter being mounted in turna-ble but longitudinally immovable relation with the disc 44 and sleeve 42. vThe core pawls 46 are normally held in engagement with the ratchet wheel 47, when the solenoids 45 are deenergized, by adjustable springs 50. The ratchet wheel 47 is so arranged that when the gear 43 is rotatedby the upward and pumping vstroke of the rack 4, said pawls cause the ratchet wheel and hence the shaft 39 to be rotated. This rota. tion ofthe shaft 39 causes the same to be moved longitudinally owin to its-threaded engagementwith the ixe bearing memeing formed as pawls engaging a ber 41. When the rackr4-descends the gear 43 rotates but nq movement isbimparted vto the shaft 39 since the pawls 46 then pa freely about the ratchet wheel 47 To positively prevent any retractive movement ffof the ratchet wheel 47, and 'shaft 39 with such retraetive movement' of the gear 43, I mount another ratchet' wheel 51 on the sleeve 48. g

The teeth of the ratchet wheel'51 are cut in the same direction as those on the wheel 47, said ratchet `wheel 51 being normally engaged by a pawl 52. This pawl 52 forms the armature of an electromagnet 53, which when energized disengages the pawl 52 from the ratchet wheel 5.1. To then cause the ratchet wheel 47 and shaft 39 to rotate in a .retractive direction, a. drum 54 is formed with the sleeve 48, on which'drum is wound a cable 55 supporting a weight 56. The magnet 34, solenoids 45 and magnet 53 are all normally deenergized and are interposed in common in a circuit as will be seen hereinafter. The threads on the two shafts 22 and 39 are eut so that with the raising of the racks 27 the shaft 22 moves away from the shaft 39, and with the raising of the rack 4 the shaft 39 will approach the shaft 22.

On the adjacent ends of the shafts 22 and 39 are mounted radial arms 57 and 58 respectively. These arms are held against longitudinal movement on the shafts and are maintained in constantly aligned relation irrespective of shaft rotation by fixedguides 60. The adjacent ends of these arms 57 and 58 carry normally separated contacts 61 which are only closed when the shaft 39 'moves lengthwise a slightly greater distance than the shaft 22 and which causes the motor circuit to be broken, as Will be hereinafter seen,

Fixed relative to the arm 57 are normally separated fixed and movablecontacts 62 and 63 respectively, hereinafter designated, in vconnection with the circuit diagram, as E. The movable contact is mounted on a flexible strip 64 adapted to be engaged by an extension 65 mounted on the arm 57. The extension 65 is normally spaced from the strip 64 and is so disposed that when the said arm 57 is shifted from its neutral or normal position by va longitudinal movement of the shaft, said strip 64 will then be engaged and deiiected so that the contacts 62 and 63 engage. The strip is disposed in longitudinal alinement with the path of movement of the extension 65 so that the contacts remain closed with any position of the arm 57 other than its neutral position.

The movement of the shaft 22 as controlled by the successive energizing of the solenoids 29 is designed to have a definite eo-relation with the movement of theshaf't 39 as controlled by the operation of the pump raclt 4.

In other words a one dollar coin deposited in the corresponding coin' chute will cause such movement of the shaft 22 that the pump motor will operate to deliver` a volume of Vliquid corresponding in value to said one dollar before the contacts 61 engage and the operation of the pump is discontinued. Also. the movement of the sha-ft 22 by each solenoid depends on the value of the coin deposited, so lthat the deposit of two fifty (ent coins in succession in the proper coin chutes will give the same movement of the shaft 22 as the depositing of the single dollar coin in the corresponding chute. This different efl'ect on the shaft 22 may be had in various Ways. In the present case for instance I have shown a vertically adjustable set screw 66 mounted in the top of each solenoid 29 s'o thatthe upward movement of the core and the consequent movement of the rack 27 and the rotation of the gear 24 and associated parts can be altered and limited to suit. The same results of course can be obtained by making solenoids of different lengths, by altering the sizes of the ratchet wheels 26, or by a different. speed ratio between the respective gears 24 and pinions 2l.

Some such arrangement however is a necessary feature since the value of the liquid is liable to iiuctuate, while the lamount delivered per stroke of the pump remains constant.

At its lower end the rack 4 has a contact 67 constantly engaging a fixed contact 68 whenever the rack is in its lowermost position. These contacts arecollectively designated as F in the circuit hereinafter shown. The rack also carries a contact 69 at its upper end to engage a fixed contact 70 only when the rack reaches the top of its stroke.` These contacts are collectively designated, as G in the circuit.

The circuit is arranged as follows: y

Utilizing the ordinary power or lighting wires 7l and 72 as the source of current, the solenoid 17 is connected to both wires so that it is constantly energized as long as the supply circuit remains energized. If the electrical supply fails, the solenoid is deenergized and the plate 14 drops in front of the coin chutes so that the prospective user will know that the system is inoperable. The plate also of course prevents the user from depositing any coins in the chutes.

The various coin closed switch or contact members D are connected in parallel to the wire 71 by a wire 73, and individually to the various solenoids 29 which in turn are connected in parallel to the wlre 72 by a wire 74. The switches D are only closed as long as coins are passing over the aprons 11, which is a sufficient time for the solenoids 29 to act. The coins must be deposited in the chutes in successive order .and not simultaneously so as to enable thevarious solenoids to act individually to cause a longitudinal movement of the shaft 22 corresponding to the total of the different solenoid rack movements. Y

Connected to the Wire 71- is a wire 75 in which the contacts E are interposed. This wire has a manually operated switch 76 beyond said contacts and leads through a .solenoid 77 and thence to the wire 72. This solenoid aetuates two switches H and J both open when the solenoid is deenergized. Another wire 78 is connected to the wire 75 ahead of the contacts E, and leads through anormally closed switch K, operated by a solenoid 79,

through a normally closed switch L operated by a solenoid 80, and thence through switch H to a Vsolenoid 81 and to the wire 72 through the last leg of the wire 75. The solenoid 81 operates a normally open switch M which is interposed in the circuit wires 82 to the motor 7, said Wires 82 being connected direct to the wires 7'1 and 72.

The contacts F are interposed in a wire 83 which leads from the Wire 75 between the contacts E and wire 78 to a solenoid 84 which operates two switches N and P, the former being closed and the latter open when the solenoid is deenergized. A wire 85 leads from the solenoid 84 through a normally open switch R controlled by a solenoid86 and thence to the wire 7 2.

The contacts G are interposed in a wire 87 which leads from the wire 75 between the wire 78 and the contacts F to the solenoid 86 and thence to a connection with the wire 85 beyond the switch R. A wire 88 leads from thecwire 87 between the contacts G and the solenoid 86 through the solenoid 79 to a connection with the wire 72 through the wire 85 beyond the switch R. A wire 89 leads from the wire 78 between the wire 7 5' and the switch K through the switch N to a normally open switch S operated by the solenoid 86 to a connection with the wire 88 ahead of the solenoid 79. The solenoid 86 has a d'ashpot arrangement 90 in connection therewithv to retard the opening of the switches R and S when said solenoid first becomes deenergized. A wire 91 leads from thewire 75 between the contacts Fand E through `the switch P to a connection with the wire 75 between the a switch 76 and solenoid 77.

A wire 92 leads from the wire 75, between the contacts E and switch 76, through a normally open switch T operated by the solenoid 80, tothe solenoids 45 and the magnets 34 -and 53. Saidsolenoid and magnets are connected to the wire 72 by a wire 93. A wire 94 'leads from the wire 75 ahead of the contacts E, through the contacts 61, to the solenoid 80 and thenceto the wire 7 2. K

A shunt wire 95 extendsbetweenthe wire 94 ahead of the solenoid 80 to the wire 92 beyond the switch T. A shunt wire 96 leads from the wireV 7 8-between the Switches L and H, through switch J to the wire 75 between the solenoid 77 and switch 7 6.

' reference number.

',In the above diagram thev various leads have been considered as beingla single wire from end to end, and have been given a single This has been done for the purpose of simplicity and convenience of description, although of course in. actual practice several different wires would be necessary to form a single continuous lead.

When the system is idle but in proper working order, all the solenoids except 17 are deenergzedand theswitches or contacts D,

' E, G, 6l, H, J, M, P, R, S, and T are open,

While thelswitches or are closed.

When the coins are successively deposited in. the respective coinchutes -the various switches D are closed, energizing the respective solenoids 29 and causing the traveller mechanism to function to move the shaft 22 and arrnJ .57 away from the follower shaft 39, the distance such shaft moves depending on the movement of the cores of the solenoids energized and the extent of movement imparted to the shaft by such core movement. During this movement of the shaft the cable 37 is wound onto the drum 36. As soon as the '.coins pass by the apronsll the circuits to the solenoids ,29 are broken and the solenoid cores and lracks drop to their normal position. The mechanism cannot rotate in a retractive direction however since all the racks 27 with the exception of the one momentarily affected by the deposit of a coin, are at all times engaged with the stops 31 and are still engaged with the ratchet wheels 26. The shaft 22 is therefore held at the position to which it has been moved by the functioning of the solenoid operating structure. As soon as the shaft 22 has started to move, the contacts E are closed by engagementVA of the arm extension with the strip 64.

No circuit is actually closed however until the customer closes the switch 76. This switch is-of the self-openingtype, so that it will remain closed only as long as the customer maintains a closing pressure thereon. A circuit is then closed from the wire 71 through the wire 75 from end to end to wire 72. This energizes'the solenoid 77 causing the switches H and J to close. A further circuit is therefore closed from the wire 7l through wires 75 and 78, through switches contacts F, K, L land N I K, L and H, solenoid 81, to wire 75 and thence to wire 72. The solenoid 81 is therefore'energized, closing the switch M. The motor circuit 82 vis thus closed, allowing the motor 7 to operate. yThis causesA the pump to operate, dispensing the liquid and causing the shaft 39 and arm 58 to be advanced toward the rec-eded shaft 22 in the manner previously explained, the cable4 55 now being wound onto the drum 54. At the same time the contacts F become opened by the upward movement of the pump rack. f

Maintaining the motor circuit closed. depends at this time upon holding the solenoid 77 energized and the switch H closed'. Closing pressure on the'Switch 76 however, having been withdrawn, the switch is open, and

the circuit to the vsolenoid 77 would thereforev n'oid 77 to wire 72. The motor circuit therefore remains closed and the motor continues to operate. l y

As soon as the pump rack reaches the top of its stroke the contacts G automatically close. This closes two circuits, one from the wire 71 through the wires 75 and 87, switch f G, solenoid 86, and wire 85 to wire 72. The other circuit is closed from wire 71 through wires 75, 87 and 88, solenoid 79 and wire 85 to wire 72. This causes the solenoid 79 to be energized, opening the switch K and consequently opening the motor circuit. ing of the first circuit energizes the solenoid 86, causing the switches R and S 'to be. closed. No circuit at present will be closed through the switch R however, since the contacts F are open. Closing of the switch S completes two circuits; one through the wires 71, 75, 78 and 89, Switch N, wire 89, switch S, and wires 89, 88 to the solenoid 79 and thence to the wire 72 through wire 85; the other through wires 75, 78 and 89, switch N, wire 89, switch S, wires 89, 88 and 87 to solenoid 86 and thence to wire 72 through wir-cs 87 and 85. The solenoids 79 and 86 are thus held closed upon the opening of switch G, which occurs immediately upon the commencement of the downward or idle stroke of the plunger. The plunger will thus move due to the action of gravity thereon, the pin-V ion 6 and motor turning backwards, which will not harm the motor, since no currentis passing through the same. l

The breaking of the circuit at K, however, also breaks the holding circuit for the solenoid 77 as previously described, so that the switches H and J become open.

When the plunger has reached the end of its downward or idle stroke the contacts F are reclosed, which completes a circuit from wire 71 through the wires 75, 83, contacts F, solenoid 84 and wires 85 to the wire 72 through the switch R. The energizing of solenoid 84 thus had closes the switch P and opens the switch N. This latter breaks the holding circuit for the solenoids 79 and 86 as above described, and allows the switch K to again close.

' With the closing of the switch P a circuit is closed from the' wire 71 to the wires 75 and 91 through the switch P back to the wire 75 and thence through the solenoid 77 to the wire 72. The solenoid 77 is thereby rcenergized, again causinfY the motor circuit to be closed by the functioning of the circuit closed by the energizing of the circuit 77, as previously explained. The pump therefore starts another upward stroke to continue dispensing the liquid and of course continues to move the shaft 39 closer to the shaft 22. The

contactsiF immediately open, breaking the circuit through the solenoid 84 and causing.

thev switch N to again close and the switch P to again open. The return of the plunger of taneously closed before the circuit is opened at R, since the return would if permature prevent the restarting of the motor.

As soon as the contacts 61 come together with the continued advancing movement of the shaft 39 and arm 58 toward the shaft 22 and arm 57, a circuit is closed from the wire 71 through the wire 75, contacts 61, wire 94, and solenoid 80 to wire 72. The Solenoid 80 is therefore energized, opening the switch L and closing` the switch T. Opening the switch L breaks the lnotor circuit, causing the niotor to stop.

Closing of the switch T closes. a circuit from the wire 71 through the wire 75 to the contacts E, through the` wires 92 and switch T, and through magnets 53 and 34 and solenoids 45 to the wire 72 through wire 93.

The energizing of the magnet 34 causes the racks 27 to be withdrawn from the ratchet wheels 26; the energizing of the solenoids 45 causes the pawls 46 to be withdrawn from the ratchet wheel 47 and the energizing of the magnet 53 causes the pawl 52 to be withdrawn from the ratchet wheel 51. The weights 38 and 56 then cause the respective traveller and follower mechanisms to be moved in a retractive direction, causing the shafts 22 and 39 to be retracted from their advanced positions.

The contacts 61 may remain engaged or they may immediately separate, but this is immaterial since a holding circuit for the solenoid 80 is maintained closed by reason of the shunt wiring 95. This maintains a circuit closed from the wire 71 through the wire 75, contacts E, wire 92, switch T, wire 95, solenoid 80, and thence to wire 72 through wire 94. This circuit will therefore remain A closed until the traveller and follower mechanisms have moved to shift the shafts 22 and 39 to their fully retracted positions, when the contacts'E open. This positively breaks the circuit through the solenoid 80 opening the switch T and deenergizing the solenoids to the commencement of discharge through hose 5.

The contacts F are normally. closed but will not cause the motor circuit to be closed unless the motor has been already set 1n operation, since the switch H is normally open and, owing tothe fact that switch R is open until after the-rack 4 has closed contacts G, can only be initially closed by I. set in motion by the depositing of the necesless of how many reciprocating movementssary. coins.

It will be seen that the motor circuit is permanently opened as soon as the contacts 61 engage, regardless of whether the pump rack has madermore than one stroke or any portion' ofI a stroke. The amount of liquid dispensed at one operation therefore depends entirely upon the initial movement of the traveller which is governed by the depositing of the necessary coins, as previously stated.

It is thus possible by providing an adequate number of coin chutes to dispense at one operation any reasonable quantity or value of liquid being handled by the apparatus.

It will also be seen from a study of the above described circuits that it is only .necessary to press the hand switch 76 once regardof the pump rack are necessary to dispense the amount of liquid paid for.

It may be noted that while for the sake of simplicity of illustration I have shown the arms 57 and58 as being constantly in -a common plane, other arrangements may be employed.

Also, while I have shown and described the pump operating means as being an electric motor, and a solenoid 77 as controlling the closing of the motor-circuit switch M, the operating means might be a gasoline, compressed air or other .motor, and lthe solenoid could be used to control the oper- .ation of a clutch, an air valve or similar mechanism.

lthough the wires 82 are shown and de- .I scribed as being directly connected to the motor, it isobvious that a circuit breaker Vor other protective device. might be interposedin the motor circuit without affecting the functioning of the system.

Should the cable and weight return mechanism for the shafts 22 and 39 prove im-` practicablefor any reason, a spring return mechanism could be installed instead, without affecting the operation of the structures. From the foregoing description it will 'be' readily seen that I have produced such a device 1as substantially fulfills the objects of the invention as set forth herein.

.While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the linvention, as defined by the appended claims.

of the switch 76, I

Having thus described my invention wlxai claim as new and useful and desire to secure by Letters Patent is: K

1. In combination with a vertical reciprocating plunger pump, and an electric motor for moving the plunger on its discharge stroke; said plun er tending. to move by gravity through t e opposite stroke when the motor is not driven, means for initially setting the motor in operation, and means controlled by the reciprocations of the pump plunger for causing the operation of the motor to be stopped as soon as a predetermined amount of liquid has been discharged fr m the pump.

2.1111 combination with a reciprocating plunger pump, and an electric motor for moving the plunger on its discharge stroke; said plunger tending to move by gravity through the opposite stroke when the motor isV not driven, hand controlled means tending to set the motor in initial operation, means controlled by the movement of the plunger for causing the driving of the motor to be discontinued when the plunger is at the end of its discharge .stroke Aand for again causing the motor to be driven when the plunger reaches the opposite end of the other stroke, and means for governing the number of discharge strokes imparte'd to the plunger by the operation of the motor.

3. In combination with a reciprocating plunger pump, and an electric motor for moving the plunger on its discharge stroke; a traveller mechanism including a contact member movable in one direction, a follower mechanism including a contact member movable to and from the first contact and normally spaced therefrom, means controlling the initial operation of the traveller and causing the contact thereof to move away from the follower contact, means opratively connecting the follower mechanism with the plunger to cause the follower contact to approach the traveller contact only with successive discharge strokes of the plunger, means operable only after the traveller mechanism has been set in operation for initially startingthe operation of the motor, and means controlled by the engagement of the contacts with each other or definitely stopping the motor.

4. In combination with a reciprocating plunger pump, and an electric motor for moving the plunger on its discharge stroke; a traveller mechanism including a contact member movable in one direction, a follower mechanism including a contact member movable to and from the first contact and normally spaced therefrom, means controlling the initial operation of the traveller-and causing the contact thereof to move away from the follower contact, means operatively connecting the lfollower mechanism with the plungerto cause the follower contact to apiii proach the traveller contact only with successive discharge strokes of the plunger, means operable only after the traveller mechanism has been set in operation for initially starting the operation of the motor, means controlled by the engagement of the contacts with each other for definitely stopping the motor, and means for initially go-verning the extent of movement of the traveller contact, whereby a corresponding extent of movement of the. follower unit must take place before the contacts engage. i

5. In combination with a reciprocating plunger pump, and an electric motor for moving the plunger on itsdischarge stroke; a traveller mechanism, means controlling the initial operation of the traveller mechanism, means operable only after the mechanism has initially moved for enab-ling the motor to be operated, and means actuated by the movement of the plunger on its discharge strokes and cooperating with the traveller mecha- ,nism for stopping the motor.

6. In combination with a reciprocating' plunger pump, and an electric motor for moving the plunger on its discharge stroke; a traveller mechanism, means controlling the initial operation of the traveller mechanism, means operable only after the mechanism has initially moved for enabling the motor to be operated, and means actuated by the movement of the plunger on its discharge strokes and cooperating with the traveller mechanism for stopping the motor, such stopping being dependent` upon the extent of movement of the traveller mechanism.

Contact movable toward the first contact and normally spaced therefrom; means between the follower contact and the plunger for causing the follower contact to be moved toward the traveller Contact a const-ant distance with each complete discharge ,stroke of the plunger, means for setting the motor in operation, and means incorporated with said last named means and dependent upon the engagement of the contacts for stopping the motor. l

8. In combination with a reciprocating plunger pump, and an electric motor for moving the plunger on its discharge stroke.; a traveller mechanism including a contact member movable in one direction, a plurality of solenoids, means for enabling the solenoids to be independently energized, means causing the energizing of the different solenoids to move the contact different distances, a follower mechanism including a contact. movable toward the first contact and normally spaced therefrom; means between the folower contact and the plunger for causing t-hefollower Contact to be moved toward `the, traveller contact a constant distance with each complete discharge stroke of the plunger, means for setting the motor in operation, means incorporated with said last named means and dependent upon theengage-ment of the contacts for stopping the motor, and means operating coincident with the stopping of the motor for causing the contacts to automatically return to their original positions.

9. In combination with a reciprocating plunger pump, and an electric motor for moving the plunger on its discharge stroke; a traveller mechanism including a contact member movable in one direction, a plurality of solenoids, means for enabling the solenoids tobe independently energized, means causing the energizing of the different solenoids to move the contact different distances, independent coin actuated means for enabling the solenoids to be independently and temporarily energized, means normally holding said contact against retractive movement when the solenoids become deenergized, a follower mechanism including a contact movable toward the first contact and incorporated with said last named means normally spaced therefrom; means operated by the plunger on its discharge strokes for causing the follower contact to be moved toward the traveller contact a constant distance with each such complete stroke, means normally holding said follower contact against retractive movement, means for initially setting the motor in operation, means incorporated with said last named means and dependent upon the engagement of the contacts for stopping the motor, means then acting to simultaneously release the traveller and follower holding means, and means for then causing said contacts to be returned to their normal positions.

10. In combination with a reciprocating plunger pump, and an electric motor for moving the' plunger on its discharge stroke; a traveller mechanism including a contact member movable in one direction, a plurality of solenoids, means for enabling the solenoids to be independently energized, means causing the energizing of the different solenoids to move the contact different distances, a follower'mechanismincluding a contact movable toward the rst contact and normally spaced therefrom; means between the follower contact and the plunger for causing the follower contact to be moved toward the traveller contact a constant distance with each complete discharge stroke of the plunger, means for setting the niotorin operation, means dependent upon the engagement of the contacts for stoppin the motor, means operating coinci-Y dent wit the stopping of the motor for caus-A ing the contacts to return to their original positions, and means dependent upon the retractive movement of the traveller contact to its original position for preventing further functioning of the motor until said contact is again caused to move in the opposite direction.

11. In combination with a pump, and a power means for operating the ump, a switch controlling the operation ofsai power means,

circuit means controlling the operation of said switch, a mechanically operated switch in said circuit means, a separate normally open hand operated switch in said circuit means, and

means included with said circuit means for said ot holdin the first named switch closer after Iier switches have been closed and the hand operated switch has been again opened, until said mechanically operated switch has been opened. y

12. In combination with a pump, and a power means for operating the ump, a switch controlling the operation of sai power means, circuit means controlling the operation of said switch, a mechanically operated switch in said circuit means, a separate normally open hand operated switch in said circuit means, and a holdin circuit for Said first named switch inclu ed with said circuit means and functioning after said switch has once been closed and until said mechanically operated switch is again opened.

13. In combination with a pump and ower means for operating the pum a switc controlling the operating of sai power means, and circuit means controlling the o eration of the switch; said circuit meansinclbuding a mechanically operated switch, a separated hand operated switch, means preventin the closing of said first named switch until oth said other switches have been closed, and means holding said first named switch closed without requiring that both said other switches remain closed together.

14.In combination with a vertical reciprocating plunger pump, and an electric motor for moving lthe plunger on its discharge stroke, said plunger tending to move by gravity through thel opposite stroke when the motor is not driven; means for initially setting the motor in operation, means for causing the motor to be alternately operated and renderedidle, and means for causing such operation to continue until a number of discharge-stroke movements of the plunger have taken place suiicient to discharge a predetermined quantity of liquid from the pump.

In testimony whe f I aix my signature.

WILLIAM C. J ONES. 

